Using GK 1001 as poweramp

At one of our shows I played through another guy's amp which was an Ampeg SVP-Pro preamp and some power-amp. I really liked the sound of the Ampeg pre so I thought if I got one of those I could use it with my GK 1001RB-II as a poweramp.

Ok, so I could connect the preamp-out on the Ampeg to the effect-return on the GK. I was just wondering:

How would I set the Ampeg's master-volume in relation to the GK's master-volume?
Set the Ampeg's master-volume fairly high and control overall volume with the GK or the other way around?

How would I set the Ampeg's master-volume in relation to the GK's master-volume? I'VE EXPERIENCE WITH THIS. I WOULD USE YOUR AMPEG VOLUME MODERATELY. PROBABLY CLOSE TO THE SAME AS THE INPUT VOLUME ON YOUR GK1001. YOU MAY FIND THAT THE AMPEG IS SLIGHTLY LOUDER OR SOFTER THAN THE GK INPUT, TRY AND MATCH THEM AS CLOSELY AS POSSIBLE.

Set the Ampeg's master-volume fairly high and control overall volume with the GK or the other way around?

I WOULD AVOID EXTREMES. TRY AND MATCH THE OUTPUT OF THE AMPEG TO THE USUAL SETTING YOU HAVE FOR YOUR GK. LEAVE ENOUGH ROOM FOR VARIATION TO ADJUST STAGE VOLUME USING THE MASTER VOLUME ON THE GK. THAT WAY, YOUR DI TO SOUNDMAN STAYS CONSISTENT. (I used a Demeter pre this way, but after awhile I decided I liked the sound of the GK solid state pre better in the long run. So much for boutique electronics! but whatever floats your boat. Good luck and happy twiddeling !)
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But I was really impressed with the Ampeg's tone at that show. (I wasn't all that impressed when I tried it at the store while shopping for an amp.)
So this way I'll have some tubey Ampeg tone when I want to without having to get a separate power-amp or selling the GK.